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In the termination phase of TCP connection, four interactions with FIN messages are usually used to cut off the connection with the client and the server. However, when one of the client or the server is abnormal, it will not be able to complete four waves to terminate the connection. At this time, RST messages will be used to forcibly interrupt the connection.If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.《本能》讲述曾任职中央情报局的情报员Dylan（Alan Cumming饰），离职后的他原本想建立了一个「正常」的生活，当起一位有才华的教授兼作家，不过当纽约警察向他寻求协助，希望他阻止个在逃的连环杀手时，他又得重回自己的旧生活了。　　古莉（张龄心 饰）和古慈（刘园园 饰）是古豹的两个女儿，古豹不甘心就此销声匿迹，遂派她们潜伏在贺定国的身边，伺机将其暗杀，古莉来到了贺定国的家中做女佣，而古慈则加入了水警，就此与小喇叭相识。随着时间的推移，古慈渐渐喜欢上了善良开朗的小喇叭，而古莉亦被贺定国的正直和执着所吸引，刺杀行动眼看就要泡汤。20岁的废柴大学生——木之下和也。和初恋女友仅接吻了一次，可只过了一个月就被甩了。The definition of a policy pattern is to define a series of algorithms, encapsulate them one by one, and make them replaceable with each other.